Styrenic resin composition and articles produced therefrom

Inactive Publication Date: 2005-01-27
NOVA CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015] The invention has met this need in the food packaging industry. It has been found by the inventors that a rubber modified styrene/maleic anhydride (SMA) copolymer with polybutene can produce a styrenic resin composition that is particularly

Problems solved by technology

However, polymers as those disclosed in the above U.S. Pat. No. 3,919,354 are generally brittle, and therefore, capable of breaking even though these

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0055] A solution containing 4.2% maleic anhydride, 1.6% polybutene H100 (BP-Amoco), 7.5% butadiene rubber, and 0.16% antioxidant (ANOX PP18, which is octadecycyl-3-(3′,5′-di-tert-butyl-4′-hydroxyphenyl)propionate (obtained through Great Lakes Chemical Corp.) was dissolved in styrene monomer, and then fed continuously to a completely filled polymerization reactor equipped with a turbine agitator similar to that of U.S. Pat. No. 2,769,804. Benzoyl peroxide initiator, 0.01% of the main stream, was added into the reactor in a separate stream. The reactor was stirred so that it was well mixed. The reacting mass was maintained at 126° C. by cooling through the reactor jacket. The average residence time in the reactor was 2.7 hours. The exit stream contained 52% polymer and was then fed continuously into a devolatilizer in which the unreacted monomer was removed. The resultant resin contained 8% maleic anhydride, 15% butadiene rubber and 2.5% polybutene. Some of the polybutene was removed...

example 2

[0058] The procedure of Example 1 was repeated except that 2% polybutene H100 (BP-Amoco) was used in the initial solution and two reactors in series were used in the polymerization. The physical properties for the test specimen obtained in Example 2 are shown in Table 2 and are compared to Comparative B specimen. Comparative B specimen was formed in a manner similar to that used to form Example 2 except that polybutene was not added to the reaction process.

TABLE 2Comparative BExample 2MA Content (%)6.46.6Rubber Content (%)13.913.5Polybutene (%) (nominal)02Rubber Particle5.35.0Size (micron)FR (g / 10 min)0.880.91DTUL (° C.)88.888.7IZOD (ft.-lbs / in.)1.812.00Strain @ Break (%)17.8727.62Stress @ Yield (ksi)3.733.59Toughness (lb. ft. / in3)699.641035.41Young's Modulus (ksi)288.99288.58

[0059] The results illustrate that the toughness and elongation properties of the resin of Example 2, which contains polybutene improved when compared to the Comparative B specimen, which does not contain pol...

example 3

[0060] The procedure of Example 2 was repeated except that 3% polybutene H100 (BP-Amoco) was used in the initial solution and all the maleic anhydride was added to the first reactor. The final resin contained 3% polybutene. The physical properties for the Example 3 specimen are shown in Table 3 and are compared to Comparative C specimen. Comparative C specimen was formed in a process similar to that used to produce Example 3, except that polybutene was not added to the reaction process.

TABLE 3Comparative CExample 3MA Content (%)12.912.5Rubber Content (%)5.75.4Polybutene (%) (nominal)03Rubber Particle Size8.810.1(micron)FR (g / 10 min)0.820.81DTUL (° C.)87.186IZOD (ft-lbs. / in)1.141.11Strain @ Break (%)10.7017.22Stress @ Yield (ksi)3.983.48Toughness (lb. ft. / in3)429.03650.20Young's Modulus (ksi)285.89269.49

[0061] The results illustrate that the toughness and elongation properties of the resin of Example 3, which contain polybutene were improved when compared to those for Comparative C...

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Abstract

Styrenic resin composition comprising a rubber modified styrene maleic anhydride copolymer and polybutene. The resin is prepared by several methods including adding polybutene into the reactor, or adding polybutene to the syrup exiting the reactor and prior to entering the devolatilizer, or compounding polybutene into the polymer in an extruder after the polymer exits the devolatilizer. The polybutene ranges from 0.1 to 8% by weight and has a number average molecular weight from 900 to 2500. The rubber ranges from 4% to 20% by weight and has a particle size from 0.1 micron to 11 microns. The resin can be extruded into sheet and thermoformed into an article or can be coextruded to produce a laminated article, which may be a container for packaged foods that can be heated in microwave ovens and which container has improved toughness, elongation, and heat distortion resistance properties.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a styrenic resin composition. More particularly, the present invention relates to a styrenic resin composition comprising a rubber modified styrene maleic anhydride (SMA) copolymer and polybutene; to articles of manufacture, e.g. thermoformed containers suitable for packaged foods that are to be heated in microwave ovens, that are produced from the styrenic resin composition and having improved properties, e.g. toughness, elongation, and heat distortion resistance; and to related methods for producing the styrenic resin composition. [0003] 2. Background Art [0004] It is known to copolymerize styrene and maleic anhydride. Such processes have been described at length in the literature, especially in Baer U.S. Pat. No. 2,971,939 and Hanson U.S. Pat. No. 2,769,804, and beneficially as a solution as disclosed in U.S. Pat. No. 3,336,267. [0005] It is known in the art to modify styrene male...

Claims

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Application Information

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IPC IPC(8): C08F255/10C08F279/02C08L23/20C08L51/06
CPCC08F255/10C08F279/02C08L23/20C08L51/06C08F222/08C08F212/08C08L2666/06C08F220/08C08L2205/02C08L2203/10
Inventor KWOK, JOHN CHI HEECOOPER, RICHARD ALBERTKRUPINSKI, STEVEN MICHAEL
Owner NOVA CHEM INC
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